Best Time to Fly LAS to MDW: On-Time Stats by Hour & Airline
Harry Reid International → Chicago Midway International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 76.0% of Las Vegas (LAS) to Chicago (MDW) flights arrived on time (2,300 scheduled flights). That is 1.7 points below the national average of 77.6%.
Southwest Airlines was the only reporting airline with regular flights on this route.
Over 24 months, Saturday was the most reliable day (86% on time) and July the worst month (71%).
The cancellation rate was 0.7% (US average 1.8%).
LAS to MDW on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlines | 76.0% | 46 min | 0.7% | 2,298 |
| Allegiant Air | Limited data | 2 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly LAS to MDW
On-time arrival % by scheduled departure hour (local time), 5,142 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 96.2% | 1.2% | 406 |
| 6am–7am | 96.4% | 0.0% | 447 |
| 7am–8am | 94.0% | 0.3% | 301 |
| 8am–9am | 85.8% | 0.6% | 331 |
| 9am–10am | 84.7% | 0.5% | 192 |
| 10am–11am | 82.5% | 0.5% | 218 |
| 11am–12pm | 79.4% | 0.0% | 449 |
| 12pm–1pm | 63.4% | 2.3% | 176 |
| 1pm–2pm | 70.6% | 1.0% | 196 |
| 2pm–3pm | 80.1% | 0.7% | 295 |
| 3pm–4pm | 68.2% | 0.3% | 284 |
| 4pm–5pm | 72.4% | 0.5% | 442 |
| 5pm–6pm | 65.4% | 0.3% | 285 |
| 6pm–7pm | 66.0% | 0.3% | 369 |
| 7pm–8pm | 51.4% | 0.7% | 144 |
| 8pm–9pm | Limited data | 11 | |
| 10pm–11pm | Limited data | 1 | |
| 11pm–12am | 82.4% | 0.8% | 595 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on LAS to MDW
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 85.4% | +4.2 pts | 3.2% | 94 |
| Christmas & New Year (Dec 20 - Jan 3) | 73.1% | -8.1 pts | 0.0% | 202 |
| Summer peak (Jun 15 - Aug 15) | 73.3% | -7.9 pts | 0.8% | 943 |
| All other days | 81.2% | — | 0.5% | 3,903 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).